Here is the full list of all 36 Hot Tub Simulator achievements.
End 50 streamings
Pop 100 extra viewers bubbles
Do ASMR 10 times
Dance 10 times
Reach 5000 viewers
Upgrade ASMR to max level
Reach streamer rank 1
Draw 10 times
Upgrade Dance to max level
Do Jumping Jacks 10 times
Do ASMR 1 time
Dance 1 time
Upgrade Jumping Jacks to max level
Get 1000 subs
Upgrade Draw to max level
Upgrade Squats to max level
Buy 10 bikinis
End 10 streamings
Get 500 subs
Do squats 10 times
Buy 6 zones
Buy 5 bikinis
Do Jumping Jacks 1 time
Buy 3 zones
Buy 1 zone
Pop 10 extra viewers bubbles
Draw 1 time
Buy 1 bikini
Get 100 subs
Reach 1000 viewers
Reach 500 viewers
Get 20 subs
End 1 streaming
Reach 100 viewers
Do squats 1 time
Pop 1 extra viewers bubble